27990139280 has 20 divisors (see below), whose sum is σ = 65077074012. Its totient is φ = 11196055680.

The previous prime is 27990139273. The next prime is 27990139327. The reversal of 27990139280 is 8293109972.

It can be written as a sum of positive squares in 2 ways, for example, as 8309416336 + 19680722944 = 91156^2 + 140288^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174938291 + ... + 174938450.

Almost surely, 2^27990139280 is an apocalyptic number.

27990139280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27990139280 is an abundant number, since it is smaller than the sum of its proper divisors (37086934732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27990139280 is a wasteful number, since it uses less digits than its factorization.

27990139280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349876754 (or 349876748 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 27990139280 in words is "twenty-seven billion, nine hundred ninety million, one hundred thirty-nine thousand, two hundred eighty".